Java instanceof与更改对象 [英] Java instanceof with changing objects

问题描述

我需要一个方法，我可以传递一个参数，我认为这是一个Class（不确定），而在该方法中，instanceof将用于检查x是否是传递的Class的一个实例。

我该怎么办？

解决方案

如何做到这一点：

  public boolean checker（Object obj）{
 return obj instanceof SomeClass; 
} 
  

或者SomeClass是一个参数：

  public boolean checker（Object obj，Class someclass）{
 return someClass.isInstance（obj）; 
} 
  

或者如果您希望实例为 someClass 而不是 someClass 的子类的实例：

  public boolean checker（Object obj，Class someclass）{
 return someClass.equals（obj.getClass（））; 
} 
  

I need a method where i could pass on a parameter which i assume would be a Class (not sure though) and in that method, instanceof would be used to check if x is an instance of the passed Class.

How should i do that? I tried a few things but none worked.

解决方案

How about this:

public boolean checker(Object obj) {
    return obj instanceof SomeClass;
}

or if SomeClass is a parameter:

public boolean checker(Object obj, Class someclass) {
    return someClass.isInstance(obj);
}

or if you want the instance to be someClass and NOT an instance of a subclass of someClass:

public boolean checker(Object obj, Class someclass) {
    return someClass.equals(obj.getClass());
}

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